Electrical Outlets (more properly known as receptacles) are types of sockets that provide power to your home's electrical system. The outlets or receptacles are where lamps, electronic equipment, small appliances, space heaters, and many other devices tap into the home's electrical circuits to fulfill their duties. Of the various types of outlets, duplex receptacles are the most common electrical outlets you’ll find in your home. Usually, they come in 15-amp or 20-amp varieties. GFCI Outlets (ground-fault circuit interrupter), and USB outlets.